Fixed param

[rok-cesnovar]

Submission Checklist

• Run unit tests
• Declare copyright holder and agree to license (see below)

Summary

Adds fixed_param and extends read_sample_csv to support fixed param runs. Closes #8

Copyright and Licensing

Please list the copyright holder for the work you are submitting
(this will be you or your assignee, such as a university or company):
Rok Češnovar

By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)

[codecov-io]

Codecov Report

Merging #147 into master will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   93.37%   93.65%   +0.28%     
==========================================
  Files           8        8              
  Lines        1448     1481      +33     
==========================================
+ Hits         1352     1387      +35     
+ Misses         96       94       -2     

Impacted Files	Coverage Δ
R/args.R	98.87% <100.00%> (+0.06%)	⬆️
R/fit.R	97.53% <100.00%> (+2.46%)	⬆️
R/model.R	96.31% <100.00%> (+0.11%)	⬆️
R/read_csv.R	99.52% <100.00%> (+0.01%)	⬆️

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